diff --git a/config.go b/config.go
index 7e2b3ee7..ffe92f06 100644
--- a/config.go
+++ b/config.go
@@ -319,7 +319,7 @@ func LoadAppConfig(adapterName, configPath string) error {
 	}
 
 	if !utils.FileExists(absConfigPath) {
-		return fmt.Errorf("the target config file: %s don't exist!", configPath)
+		return fmt.Errorf("the target config file: %s don't exist", configPath)
 	}
 
 	if absConfigPath == appConfigPath {
diff --git a/grace/server.go b/grace/server.go
index f4512ded..101bda56 100644
--- a/grace/server.go
+++ b/grace/server.go
@@ -90,16 +90,15 @@ func (srv *Server) ListenAndServeTLS(certFile, keyFile string) (err error) {
 		addr = ":https"
 	}
 
-	config := &tls.Config{}
-	if srv.TLSConfig != nil {
-		*config = *srv.TLSConfig
+	if srv.TLSConfig == nil {
+		srv.TLSConfig = &tls.Config{}
 	}
-	if config.NextProtos == nil {
-		config.NextProtos = []string{"http/1.1"}
+	if srv.TLSConfig.NextProtos == nil {
+		srv.TLSConfig.NextProtos = []string{"http/1.1"}
 	}
 
-	config.Certificates = make([]tls.Certificate, 1)
-	config.Certificates[0], err = tls.LoadX509KeyPair(certFile, keyFile)
+	srv.TLSConfig.Certificates = make([]tls.Certificate, 1)
+	srv.TLSConfig.Certificates[0], err = tls.LoadX509KeyPair(certFile, keyFile)
 	if err != nil {
 		return
 	}
@@ -113,7 +112,7 @@ func (srv *Server) ListenAndServeTLS(certFile, keyFile string) (err error) {
 	}
 
 	srv.tlsInnerListener = newGraceListener(l, srv)
-	srv.GraceListener = tls.NewListener(srv.tlsInnerListener, config)
+	srv.GraceListener = tls.NewListener(srv.tlsInnerListener, srv.TLSConfig)
 
 	if srv.isChild {
 		process, err := os.FindProcess(os.Getppid())